New Product Information for Chevrolet S10 Pickup - 4WD 2003
The purpose of New Product Information is to highlight or indicate
important product changes from the previous model year.
Changes may include one or more of the following items:
| • | A component comparison from the previous year |
| • | Torque values and/or fastener tightening strategies |
| • | Changed engine specifications |
| • | New sealants and/or adhesives |
| • | Disassembly and assembly procedure revisions |
| • | Engine mechanical diagnostic procedure revisions |
| • | New special tools required |
Component Comparison
| • | New Central Multipoint Flexible Injection (MFI) fuel system. |
| • | EGR valve and components are deleted. |
| • | Revised lower intake manifold due to the deletion of the EGR. |
Torque Values and/or Fastener Tightening Strategies
| • | Cylinder head bolts, the crankshaft bearing cap bolts, the connecting
rod bolts, and balance shaft bolt apply a torque angle strategy. |
| | In an on-vehicle situation where a torque angle meter may not
fit into the vehicle packaging, a three step tightening process may be followed
using a torque wrench. |
| • | Certain fasteners should not be reused. Bolts, studs, or other
fasteners that must be replaced will be called out in the specific service
procedure. |
Changed Engine Specifications
| • | Crankshaft Main Bearing Bore Out-of-Round spec is
now 0.05 mm (0.002 in). |
| • | Cylinder Bore Out-of-Round-Production spec
is now 0.017 mm (0.0007 in). |
| • | Cylinder Head Deck Surface Flatness spec is now 0.050-0.152 mm
(0.002-0.006 in). |
| • | Piston Ring-to-Groove Clearance-Second Compression
Ring-Production spec is now 0.076-0.280 mm (0.0030-0.0110 in). |
| • | Piston Ring-to-Groove Clearance-Oil Control
Ring-Service spec is now 0.076-0.200 mm (0.0030-0.0079 in). |
New Sealants and/or Adhesives
No new sealants or adhesives have been added.
Disassembly and Assembly Procedure Revisions
| • | Intake manifold disassembly and assembly has changed due to the
deletion of the EGR and new Central (MFI) fuel system. |
| • | Measuring Connecting Rod Bearing Clearances has changed due to
a tool revision. |
| • | Engine Preluber procedure has been added to this section. |
| • | Discard all used gaskets, seals or O-ring seals unless
otherwise indicated. |
| • | MFI fuel system procedure. |
Engine Mechanical Diagnostic Procedure Revisions
| • | Coolant in Combustion Chamber diagnostic information has been
added. |
| • | Coolant in Engine Oil diagnostic information has been added. |
New Special Tools Required
No new special tools are required.
